Containers and its methods in Dynamics 365 for Finance and Operations

public void containerClasses()
{
container con;

    //Initialize container
    con = ["Serv001", 897, 123];

    //Insert into container
    conIns(con, 1, "Serv001");
    conIns(con, 2, 1234.80);
    conIns(con, 3, 123);

    //Retrieve the value
    conPeek(con, 1); //Serv001

    //Update container
    conPoke(con, 2, 897); //Serv001, 897, 123

    //Delete the value
    conDel(con, 2, 1); //Serv001, 123
}